I wrote this on my blog, and so welcome you to read it there. I know there was at least one FlyerTalker on the return flight, so I'd be curious to hear what his perception may have been (though I do think he was lucky enough to sleep most of the way through).
Flights were:
3/19: DL 0119 JFK to CPH
3/20: DL 0118 CPH to JFK
The full review